“…Further, F doped MnTiO 3 shows improved separation of charges and degrades rhodamine B under visible light [63]. Some of the promising titanates photocatalysts have been listed in Table 1, as a part of compilation of perovskite systems.…”
Section: Simple Perovskites With Visible Light Responsementioning
Abstract:Perovskite-based photocatalysts are of significant interest in the field of photocatalysis. To date, several perovskite material systems have been developed and their applications in visible light photocatalysis studied. This article provides a review of the visible light (λ > 400 nm) active perovskite-based photocatalyst systems. The materials systems are classified by the B site cations and their crystal structure, optical properties, electronic structure, and photocatalytic performance are reviewed in detail. Titanates, tantalates, niobates, vanadates, and ferrites form important photocatalysts which show promise in visible light-driven photoreactions. Along with simple perovskite (ABO3) structures, development of double/complex perovskites that are active under visible light is also reviewed. Various strategies employed for enhancing the photocatalytic performance have been discussed, emphasizing the specific advantages and challenges offered by perovskite-based photocatalysts. This review provides a broad overview of the perovskite photocatalysts, summarizing the current state of the work and offering useful insights for their future development.
“…Further, F doped MnTiO 3 shows improved separation of charges and degrades rhodamine B under visible light [63]. Some of the promising titanates photocatalysts have been listed in Table 1, as a part of compilation of perovskite systems.…”
Section: Simple Perovskites With Visible Light Responsementioning
Abstract:Perovskite-based photocatalysts are of significant interest in the field of photocatalysis. To date, several perovskite material systems have been developed and their applications in visible light photocatalysis studied. This article provides a review of the visible light (λ > 400 nm) active perovskite-based photocatalyst systems. The materials systems are classified by the B site cations and their crystal structure, optical properties, electronic structure, and photocatalytic performance are reviewed in detail. Titanates, tantalates, niobates, vanadates, and ferrites form important photocatalysts which show promise in visible light-driven photoreactions. Along with simple perovskite (ABO3) structures, development of double/complex perovskites that are active under visible light is also reviewed. Various strategies employed for enhancing the photocatalytic performance have been discussed, emphasizing the specific advantages and challenges offered by perovskite-based photocatalysts. This review provides a broad overview of the perovskite photocatalysts, summarizing the current state of the work and offering useful insights for their future development.
“…Among various semiconductor photo-catalysts, the perovskite type ABO 3 oxides (A and B are two cations of different sizes) have received considerable attention for their good abilities towards water splitting and organic pollutant degradation under visible light or UV irradiation [11,12,13]. Particularly, manganese titanate MnTiO 3 is the most stable perovskite type oxide and a favorable material with strong adsorption in the visible region which appear suitable for photocatalysis applications [14,15,16,17]. However, He et al have reported the photodegradation of aqueous methyl orange on MnTiO 3 powder at different initial pH and it was found that this catalyst showed promise for use in many applications in heterogeneous catalysis and decontamination of the environment [16].…”
Nanophotocatalyst MnTiO 3 powders were synthesized by sol-gel technique and characterized by means of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), as well as their thermal behavior has been studied by differential thermal and thermogravimetric analyses (DTA/TGA). Powders morphology was analyzed by means of Transmission electron microscopy (TEM). Effect of various process parameters like amount of photocatalyst, dye concentration, solution pH and irradiation time on the extent of removal of dye were studied in detail. The photo-degradation was relatively higher using lower amount (0.005 g) of semiconductor, reached rate of 75% and 70% after 240 min for mixed MnTiO 3 /TiO 2 and pure MnTiO 3 nanocatalysts. The kinetic model of photocatalytic degradation of MB follows pseudo-first-order kinetic with a high correlation coefficient values (R 2 > 0.95). These results underline the use of effective, low-cost and easily available MnTiO 3 photocatalyst for the decomposition of pollutants to water under natural sunlight.
“…An insignificant amount of dye removal detected in the absence of MTO nanodiscs ( Figure 6 ) confirmed the influence of MTO nanodiscs in the photocatalytic degradation of dye pollutants. The excellent absorption of pollutants and the photosensitizing effect of the MTO nanodiscs might have helped consume a significant amount of visible light to enhance the photocatalytic mechanism [ 34 ]. Figure 4 UV-Vis DRS spectra and bandgap analysis of MTO nanodiscs.…”
MTO nanodiscs synthesized using the hydrothermal approach were explored for the photocatalytic removal of methylene blue (MB), rhodamine B (RhB), congo red (CR), and methyl orange (MO). The disc-like structures of ~16 nm thick and ~291 nm average diameter of stoichiometric MTO were rhombohedral in nature. The MTO nanodiscs delivered stable and recyclable photocatalytic activity under Xe lamp irradiation. The kinetic studies showed the 89.7, 80.4, 79.4, and 79.4 % degradation of MB, RhB, MO, and CR at the rate constants of 0.011(±0.001), 0.006(±0.001), 0.007(±0.0007), and 0.009 (±0.0001) min
−1
, respectively, after the 180 min of irradiation. The substantial function of photogenerated holes and hydroxide radicals pertaining to the dye removal phenomena is confirmed by radical scavenger trapping studies. Overall, the present studies provide a way to develop pristine and heterostructure perovskite for photocatalysts degradation of various organic wastes.
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